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Subject :NSO    Class : Class 3

Gases represented by 1 and 2 in the given picture arerespectively



AOxygen, Carbon dioxide
BOxygen, Nitrogen
CNitrogen, Carbon dioxide
DCarbon dioxide, Oxygen


Ans 1:

Class : Class 3
Answer is D because at night plants take in oxygen and give out carbon-di-oxide whereas we humans always take in oxygen and give out carbon-di-oxide.

Ans 2:

Class : Class 4
Sorry ,answer is A .I gave wrong explanation why .You have told arerespectively, so gas 1 is carbon dioxide and gas 2 is oxygen.You have given the order as 1 and 2 i.e. carbon dioxide and oxygen.So ,we will say it as 2 and 1 i.e oxygen and carbon dioxide .Hence answer is A.

Ans 3:

Class : Class 3
A

Ans 4:

Class : Class 4

Ans 5:

Class : Class 5
A

Ans 6:

Class : Class 4
ans is A as the order of gases will not change

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